Harrow-disk sharpener



\ (No Model!) M. AVCAMERON {Sn-G. T. DAWSON. HARROW DISK SHRPENER.

No. 525,090. Patented Aug.

lwww lrye 916115', Jion roJL unieron/Q wilgessas UNITED. Sf'rArEsAPATENT OFFICE.

MONROE A. CAMERON AND GEORGE T. DAWSON, OF FULDA, MINNESOTA,

ASSIGNORS TO LEE S. STRAIGHT,

OF EL PASO, AND THE R; HERSCHEL MANUFACTURING OOMPANYOF PEORIA,ILLINOIS.

HARROW-DISK SHARPE`NER.

SPECIFICATION forming part of Letters Patent No. 525,090, dated August28, 1894.

Application tiled March 15, I894. Serial No. 503.775- (No model.) i

To @ZZ whom it may concern..-

Be it known that we, MONROE A. CAMERON and GEORGE T. DAWSON, citizens ofthe United States, residing at Fulda, in the county of Murray and Stateof Minnesota, have invented a new and useful Harrow-Disk Sharpener, ofwhich the following is a speoication. Our invention relates to animprovement in those harrow disk Sharpeners, which are,v adapted to beconnected to the axle or shaft of the disks and provided with knivesadapted to engage the disks and sharpen their edges, either by turningthe tool or by causing the disks to revolve; and it consists in certainimproved features of construction and combination and arrangement ofparts that will be more fully described hereinafterl and finallyembodied inthe claim.

In the accompanying drawings-Figure 1 represents a perspective view of aharrow disk and axle, showing our improved tool in the act of sharpeningthem. Fig. 2 is a longitudinal section taken through the appliance. Fig.3 is a cross section taken horizontally through the sharpening blade.Fig. 4 is a detail perspective of the knife. Fig. 5 is a similar view ofthe main Or'body portion stripped of its attachments.

The reference numeral 1 indicates the aXle or shaft upon which the disk2 is shown as mounted, and these two devices may be of any constructionor kind, since our device is capable of use in connection with allharrow disks.

The Sharpener consists of a main or body portion 3, formed preferably ofcast steel and Iiattened or shaped rectangular in cross-section, asshown.

Formed at the outer end of the body 3 and disposed at right angles tothe cross sectional disposition of the body are the arms 4, whichconstitute a fork and this is adapted to embrace the axle 1, so as toconnect the axle and body 3, andyet make it possible to move themindependently when so connected.

The arms 4 are form ed with a substantially semi-circular juncture orfork so that they can better receive the axle l. Formed in the body 3,andextending nearly its entire length l .is'the longitudinal slot 5, inwhich the bind- 5o ing bolt 6 of the Sharpener 7 is adapted to operate,and to move longitudinally therein.

The Sharpener or knife 7 consists of a thick plate of steel having amiddle openin g adapted for the bolt 6, by which it is connected to the5.5 body. Formed in the lower edge of the plate 7, and adjacent to eachend respectively are the two openings 8, which are triangular in shapeand provided with the beveled edges 9. These are formed on each of theirsides, 6o and constitute'the means for' sharpening the disks.

10 indicates a handle, preferably wood, which is secured to the upperend of the body 3, by means of the bolts l1, and by which the device isheld when in use.

The use of our device is shown in Fig. 1; and, supposing that it isdesired to sharpen the disk shown in such figure the device is placed onthe right hand side of the disk so 7o that the arms 4 will embrace theaxle, l. The blade 7 is then adjusted to engage the periphery of thedisk, and the notch or opening 8, which is on the left hand end of theplatef, allowed to receive such periphery. Whenso arranged the curve inthe disk will cause its edge to lie in engagement with the left handside of the notch in which it is arranged', while theright hand side ofthe notch will lie parallel with the right hand periphery of 8o thedisk.

To effect vthe operation of sharpening, after the tool has beenadjusted,'the device may either be oscillated on its arms 4, leaving thedisk stationary, and by means of the handle 10, or the tool may be heldStationary and the disk made to rotate. In event of the latter mode, therotating of the disk may be effected by causing the harrow to be drawnas when in use, and holding the knife in position, with 9o the help ofan attendant seated on the harrow, or by turning the harrow over, andafxing to the axle a crank, whereby it, andv its attached disks, may beturned against the stationary tool.

Movement either by the .disks or tool will cause the edge 9, which isengaged with the disk, to cut it away and leave the disk with its edgeshaped, in cross section, like the shape of the space between the edges9 of the recess 8, and consequently sharpened.

It will be seen that the sharpening plate 7 may be adjusted bothlongitudinally, in relation to the body, or axially, in relation to thebolt which holds the plate, thus making the appliance applicable to allsizes of disks, and capable of sharpening them with various degrees ofedges; for by turning the plate 7 the notches 8 may be disposed so thatthey will make the bevel of the edge a long or short one. By means ofthe two notches 8, the tool can readily sharpen disks with their edgesdisposed either to the right or left and by the arangement, which Weemploy the proper adjustment may be obtained by placing the tool on theside of the disk to which its edge is disposed, This is shown in Fig. l,and needs, therefore no further description.

Having described our invention, what we claim is- A sharpening devicefor harrow disks, and

said notch being adapted to receive the periphery of the disk, and tosharpen the same by the movement of the plate or disk, substantially asdescribed.

In testimony that We claim the foregoing as our own We have heretoaffixed our signatures in the presence of two Witnesses.

MONROE A. CAMERON. GEORGE T. DAWSON. VVtnesses:

J. W. DIoKsoN, JOHN BURNER.

